source table - the table or view name from which the data will be imported.

where clause - optional. You can add predicates clauses to the WHERE clause as part of the SQL query that is built in order to get the data from the database. Make sure to omit the keyword WHERE. e.g.:

good: prod_category = 1 AND prod_color = 'red'

bad: WHERE prod_category = 1 AND prod_color = 'red'

or query - type in a SQL query. Make sure to name all columns uniquely and do not change the column orders as their position is important when reading the data.